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 Post subject: RCA SP 10 info
PostPosted: Oct Mon 28, 2019 4:50 am 
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Joined: Oct Mon 28, 2019 4:37 am
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I acquired an RCA SP 10 today and was hoping someone here might provide some information about it. Haven't had much luck searching for schematics etc...
Any opinions or info will be greatly appreciated.


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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Mon 28, 2019 1:01 pm 
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This one?
https://www.radiomuseum.org/r/rca_sp_10 ... 12190.html

If so, they indicate that there is a Sam's Photofact for it. For that, check here:
https://stevenjohnson.com/manuals/schematics.htm

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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Mon 28, 2019 1:06 pm 
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Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
Here is link to SAMS.

Bill J.

https://app.box.com/s/5wlhrj44ho23qjz6sajt0ax9eqfey7uf


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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Mon 28, 2019 7:52 pm 
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NumberMaj 1 wrote:

Thanks! Much appreciated.


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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Tue 29, 2019 4:46 am 
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pixellany wrote:
This one?
https://www.radiomuseum.org/r/rca_sp_10 ... 12190.html

If so, they indicate that there is a Sam's Photofact for it. For that, check here:
https://stevenjohnson.com/manuals/schematics.htm


Thanks to you too!


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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Tue 29, 2019 3:50 pm 
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Location: Fernandina Beach, FL
Interesting, ½ 12AU7 is an AF amplifier, the second half is the phase inverter and then they use two 6AU6 tubes as drivers for the 6V6PP output. Never have seen that before, but I guess being a hobbyist instead of professional, not unusual!

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 Post subject: Re: RCA SP 10 info
PostPosted: Oct Tue 29, 2019 5:04 pm 
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Location: Boston, MA USA
That's called a Williamson design. Very popular in the 1950s.

-David


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Sat 02, 2019 4:09 am 
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Location: Dos Rios, CA. region
I may have the RCA spec sheet for this I can scan, send a PM with your email and I'll take a look in my RCA binder.
I don't remember if it shows a schematic, so good that there is a photofact available...
Lots of RCA broadcast/hi-fi stuff does not have photofacts.
Kent


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Mon 04, 2019 4:20 am 
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I got schematics for both the amp and pre.
Still hoping for listening impressions from anyone with direct experience.


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Mon 04, 2019 4:44 am 
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Location: Dos Rios, CA. region
It looks like an interesting sounding amp, I have not heard it, has not been affordable the last ten years when I've seen it available.
All I had in my files was the SP-20 photofact it turns out, no spec sheet...


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Mon 04, 2019 1:55 pm 
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ampstamp88 wrote:
It looks like an interesting sounding amp, I have not heard it, has not been affordable the last ten years when I've seen it available.
All I had in my files was the SP-20 photofact it turns out, no spec sheet...

It's certainly a nice looking chassis. Nice heavy transformers and nothing sloppy about the overall assembly.
I am wondering if I should overhaul it or just try to get it running and move it along unmolested?


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Mon 04, 2019 5:04 pm 
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It would be worth your time replacing the filter and paper caps, checking tubes, resistors, etc if you intend on listening to it and using it in the future, lots of us ARFers would be willing to help if you run into difficulty....
If you do decide to use it, you may consider finding another for a "stereo" dual mono amp pair for listening to records, i-pod, cassettes, etc
You would have a high quality system for a fraction of the price of a "name" brand.
Otherwise best to leave it alone unmolested if you intend on re-selling it or passing it on...Shouldn't power it up without a variac or a knowlegeable electronics person present...


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 Post subject: Re: RCA SP 10 info
PostPosted: Nov Tue 05, 2019 3:23 pm 
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Joined: Oct Mon 28, 2019 4:37 am
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ampstamp88 wrote:
It would be worth your time replacing the filter and paper caps, checking tubes, resistors, etc if you intend on listening to it and using it in the future, lots of us ARFers would be willing to help if you run into difficulty....
If you do decide to use it, you may consider finding another for a "stereo" dual mono amp pair for listening to records, i-pod, cassettes, etc
You would have a high quality system for a fraction of the price of a "name" brand.
Otherwise best to leave it alone unmolested if you intend on re-selling it or passing it on...Shouldn't power it up without a variac or a knowlegeable electronics person present...

I have some experience rebuilding various tube gear and am familiar with test procedures for gear that hasn't been used for unknown periods of time so I know enough to not just plug it in and fire it up. I've done some checkout on resistors and so far they appear to be within spec. Somewhere I have a tube tester and will be testing those as well.
Thanks for the feedback, seems like an uncommon amp so getting opinions has been a bit slower than I expected.


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